Improve regex efficiency when trimming long ua string

https://blog.stevenlevithan.com/archives/faster-trim-javascript

Author: faisalman

src/ua-parser.js

@@ -91,7 +91,7 @@
         },
         trim = function (str, len) {
             if (typeof(str) === STR_TYPE) {
-                str = str.replace(/^\s+|\s+$/g, EMPTY);
+                str = str.replace(/^\s\s*/, EMPTY).replace(/\s\s*$/, EMPTY);
                 return typeof(len) === UNDEF_TYPE ? str : str.substring(0, UA_MAX_LENGTH);
             }
     };